At present the processes occurring in the Swash Zone (SZ) are disregarded by all available wave-averaged nearshore circulation models. Only recently a series of studies has proposed an approach to solve this problem by means of Shoreline Boundary Conditions (SBCs) obtained from integrating the Nonlinear Shallow Water Equations over the SZ width. While hydrodynamic conditions are a consolidated and validated theoretical tool, morphodynamic conditions (MSBCs) still require theoretical inspection and experimental validation. We here focus on a theoretical analysis of the problem, which, on the basis of available experimental data, aims at clarifying the role of short- and long-wave contributions to the mentioned MSBCs.

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